If you don't mind, can you lead us to this case through link or something. AFAIK, in such cases of the user has ample/sufficient proof that he owns the account that initially published/posted the article in another platform, social media or whatever, then they prolly wouldn't be banned, the only problem here is the means by which such user is going to prove beyond reasonable doubts to be reposting an already existing work of his. Having said that though, copying your article exactly the same way and posting on numerous platforms is somewhat unnecessary, since you wrote the initial topic yourself, you can just basically do a brief overview of it, and obviously it'll come in different words, then at the end of it, you just simply put a link to of course the original source which still happens to be your work.